@charset "UTF-8";
/*! normalize.css v4.0.0 | MIT License | github.com/necolas/normalize.css */
/**
 * 1. Change the default font family in all browsers (opinionated).
 * 2. Prevent adjustments of font size after orientation changes in IE and iOS.
 */
html {
  font-family: sans-serif;
  /* 1 */
  -ms-text-size-adjust: 100%;
  /* 2 */
  -webkit-text-size-adjust: 100%;
  /* 2 */ }

/**
 * Remove the margin in all browsers (opinionated).
 */
body {
  margin: 0; }

/* HTML5 display definitions
   ========================================================================== */
/**
 * Add the correct display in IE 9-.
 * 1. Add the correct display in Edge, IE, and Firefox.
 * 2. Add the correct display in IE.
 */
article,
aside,
details,
figcaption,
figure,
footer,
header,
main,
menu,
nav,
section,
summary {
  /* 1 */
  display: block; }

/**
 * Add the correct display in IE 9-.
 */
audio,
canvas,
progress,
video {
  display: inline-block; }

/**
 * Add the correct display in iOS 4-7.
 */
audio:not([controls]) {
  display: none;
  height: 0; }

/**
 * Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
progress {
  vertical-align: baseline; }

/**
 * Add the correct display in IE 10-.
 * 1. Add the correct display in IE.
 */
template,
[hidden] {
  display: none; }

/* Links
   ========================================================================== */
/**
 * Remove the gray background on active links in IE 10.
 */
a {
  background-color: transparent; }

/**
 * Remove the outline on focused links when they are also active or hovered
 * in all browsers (opinionated).
 */
a:active,
a:hover {
  outline-width: 0; }

/* Text-level semantics
   ========================================================================== */
/**
 * 1. Remove the bottom border in Firefox 39-.
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */
abbr[title] {
  border-bottom: none;
  /* 1 */
  text-decoration: underline;
  /* 2 */
  text-decoration: underline dotted;
  /* 2 */ }

/**
 * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
 */
b,
strong {
  font-weight: inherit; }

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */
b,
strong {
  font-weight: bolder; }

/**
 * Add the correct font style in Android 4.3-.
 */
dfn {
  font-style: italic; }

/**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Firefox, and Safari.
 */
h1 {
  font-size: 2em;
  margin: 0.67em 0; }

/**
 * Add the correct background and color in IE 9-.
 */
mark {
  background-color: #ff0;
  color: #000; }

/**
 * Add the correct font size in all browsers.
 */
small {
  font-size: 80%; }

/**
 * Prevent `sub` and `sup` elements from affecting the line height in
 * all browsers.
 */
sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline; }

sub {
  bottom: -0.25em; }

sup {
  top: -0.5em; }

/* Embedded content
   ========================================================================== */
/**
 * Remove the border on images inside links in IE 10-.
 */
img {
  border-style: none; }

/**
 * Hide the overflow in IE.
 */
svg:not(:root) {
  overflow: hidden; }

/* Grouping content
   ========================================================================== */
/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
code,
kbd,
pre,
samp {
  font-family: monospace, monospace;
  /* 1 */
  font-size: 1em;
  /* 2 */ }

/**
 * Add the correct margin in IE 8.
 */
figure {
  margin: 1em 40px; }

/**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */
hr {
  box-sizing: content-box;
  /* 1 */
  height: 0;
  /* 1 */
  overflow: visible;
  /* 2 */ }

/* Forms
   ========================================================================== */
/**
 * Change font properties to `inherit` in all browsers (opinionated).
 */
button,
input,
select,
textarea {
  font: inherit; }

/**
 * Restore the font weight unset by the previous rule.
 */
optgroup {
  font-weight: bold; }

/**
 * Show the overflow in IE.
 * 1. Show the overflow in Edge.
 * 2. Show the overflow in Edge, Firefox, and IE.
 */
button,
input,
select {
  /* 2 */
  overflow: visible; }

/**
 * Remove the margin in Safari.
 * 1. Remove the margin in Firefox and Safari.
 */
button,
input,
select,
textarea {
  /* 1 */
  margin: 0; }

/**
 * Remove the inheritence of text transform in Edge, Firefox, and IE.
 * 1. Remove the inheritence of text transform in Firefox.
 */
button,
select {
  /* 1 */
  text-transform: none; }

/**
 * Change the cursor in all browsers (opinionated).
 */
button,
[type="button"],
[type="reset"],
[type="submit"] {
  cursor: pointer; }

/**
 * Restore the default cursor to disabled elements unset by the previous rule.
 */
[disabled] {
  cursor: default; }

/**
 * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
 *    controls in Android 4.
 * 2. Correct the inability to style clickable types in iOS.
 */
button,
html [type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
  /* 2 */ }

/**
 * Remove the inner border and padding in Firefox.
 */
button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0; }

/**
 * Restore the focus styles unset by the previous rule.
 */
button:-moz-focusring,
input:-moz-focusring {
  outline: 1px dotted ButtonText; }

/**
 * Change the border, margin, and padding in all browsers (opinionated).
 */
fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em; }

/**
 * 1. Correct the text wrapping in Edge and IE.
 * 2. Correct the color inheritance from `fieldset` elements in IE.
 * 3. Remove the padding so developers are not caught out when they zero out
 *    `fieldset` elements in all browsers.
 */
legend {
  box-sizing: border-box;
  /* 1 */
  color: inherit;
  /* 2 */
  display: table;
  /* 1 */
  max-width: 100%;
  /* 1 */
  padding: 0;
  /* 3 */
  white-space: normal;
  /* 1 */ }

/**
 * Remove the default vertical scrollbar in IE.
 */
textarea {
  overflow: auto; }

/**
 * 1. Add the correct box sizing in IE 10-.
 * 2. Remove the padding in IE 10-.
 */
[type="checkbox"],
[type="radio"] {
  box-sizing: border-box;
  /* 1 */
  padding: 0;
  /* 2 */ }

/**
 * Correct the cursor style of increment and decrement buttons in Chrome.
 */
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
  height: auto; }

/**
 * Correct the odd appearance of search inputs in Chrome and Safari.
 */
[type="search"] {
  -webkit-appearance: textfield; }

/**
 * Remove the inner padding and cancel buttons in Chrome on OS X and
 * Safari on OS X.
 */
[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none; }

/*初始化*/
* {
  padding: 0;
  margin: 0;
  outline: none; }

a {
  color: #fff;
  text-decoration: none; }
  a:hover, a:visited {
    color: #fff; }

li {
  list-style-type: none; }

body {
  font-family: "Helvetica Neue", Helvetica, Arial, "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  font-size: 14px;
  line-height: 1.42857143;
  color: #616161;
  word-wrap: break-word;
  min-width: 1210px; }

/*头部导航*/
.header-top {
  height: 60px;
  background: #212121;
  padding: 0 20px; }

.logo, .nav-bar, .search, .nav-bar, .nav-user {
  height: 100%;
  display: inline-block; }

.logo {
  float: left; }
  .logo img {
    border-radius: 10px; }

/*搜索栏*/
.search {
  color: #fff;
  margin: 14px 0;
  float: right; }
  .search input {
    border: none;
    border-radius: 20px;
    padding: 5px 10px;
    color: #333; }
  .search span {
    margin: 0 15px; }

/*头部一级菜单*/
.nav-bar-menu {
  height: 100%;
  margin-left: 20px; }
  .nav-bar-menu li {
    position: relative;
    height: 100%;
    display: inline-block;
    margin-right: 40px; }
    .nav-bar-menu li a {
      height: 100%;
      width: 100%;
      display: block;
      line-height: 60px; }

/*二级菜单*/
.all-menu-course {
  z-index: 99999999999999999;
  display: none;
  position: absolute;
  background: #fff;
  left: -20px;
  top: 60px;
  width: 126px;
  text-align: center;
  border-radius: 5px;
  border: none; }
  .all-menu-course li {
    position: relative;
    height: 40px;
    width: 100%;
    display: block; }
  .all-menu-course a {
    line-height: 40px !important;
    color: #333; }
    .all-menu-course a:hover {
      background: #4296c5;
      color: #fff !important; }

.li-all-course:hover .all-menu-course {
  display: block; }

.all-menu-course > li:hover .menu-course-sub {
  display: block; }

/*三级菜单*/
.menu-course-sub {
  display: none;
  position: absolute;
  top: 0px;
  left: 127px;
  background-color: #fff;
  border-radius: 5px;
  width: 100%; }

/*ad页面*/
.div-slide-ad .swiper-container {
  top: -28px;
  width: 100%;
  height: 300px; }
  .div-slide-ad .swiper-container img {
    width: 100%;
    height: 300px; }

.div-slide-ad .pagination {
  position: absolute;
  z-index: 20;
  left: 50%;
  bottom: 10px;
  /*轮播选择按钮*/ }
  .div-slide-ad .pagination .swiper-pagination-switch {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 8px;
    background: #222;
    margin-right: 8px;
    opacity: 0.8;
    border: 1px solid #fff;
    cursor: pointer; }
  .div-slide-ad .pagination .swiper-visible-switch {
    background: #aaa; }
  .div-slide-ad .pagination .swiper-active-switch {
    background: #fff; }

/*课程section*/
.course-section {
  margin: 0 10%;
  text-align: center; }
  .course-section h1 {
    margin: -5px  0; }
  .course-section .course-list-course {
    width: 80%;
    float: left; }
  .course-section .video-rank {
    float: right;
    display: inline-block; }

.course-section:after {
  content: "";
  display: block;
  clear: both; }

/*tag导航栏*/
.course-list-course-nav ul {
  text-align: left;
  margin-bottom: 10px; }
  .course-list-course-nav ul li {
    display: inline-block;
    margin-right: 30px; }
    .course-list-course-nav ul li a {
      color: #333;
      border-radius: 4px;
      padding: 10px 15px;
      display: block; }
      .course-list-course-nav ul li a:hover {
        background-color: #4296c5;
        color: #fff; }

/*tab切换课程页面*/
.warp_show {
  background-color: #4296c5;
  color: #fff !important; }

/*课程页*/
.warp {
  display: none;
  width: 100%; }
  .warp .div-courses {
    margin-bottom: 15px;
    width: 30%;
    margin-right: 3%;
    float: left;
    border-bottom: 1px solid #ccc;
    box-shadow: 3px 6px 20px #ccc;
    border-radius: 5px; }
    .warp .div-courses img {
      width: 100%;
      border-radius: 5px;
      height: 150px; }
    .warp .div-courses .cont {
      text-align: left; }
      .warp .div-courses .cont .title {
        margin: 5px; }
      .warp .div-courses .cont .clicks {
        font-size: 12px;
        color: #666;
        margin: 5px 10px 8px 10px; }
    .warp .div-courses span {
      color: #333;
      display: block; }

/*视频排行*/
.video-rank {
  text-align: center;
  width: 20%; }
  .video-rank .title {
    float: left;
    text-align: left;
    border-radius: 4px;
    padding: 10px 15px;
    background-color: #4296c5;
    color: #fff;
    margin-bottom: 10px; }
  .video-rank .videos-list {
    clear: both;
    background-color: #fff;
    margin-top: 20px;
    text-align: left; }
    .video-rank .videos-list li {
      padding: 15px 15px; }
    .video-rank .videos-list a {
      padding: 0 6px;
      margin-left: 1px;
      color: #333;
      display: block; }
      .video-rank .videos-list a:hover {
        margin-left: 0;
        color: #4296c5;
        border-left: 1px solid #4296c5; }
      .video-rank .videos-list a span {
        width: 20px;
        display: inline-block;
        color: #8f8F8F; }

/*网站介绍*/
.introduction-section {
  margin: 50px 0 0 0;
  padding: 50px 0;
  position: relative;
  background-color: #4296c5;
  text-align: center; }
  .introduction-section .xxaq {
    width: 390px;
    text-align: center;
    display: inline-block; }
    .introduction-section .xxaq img {
      width: 45%; }

/*teacher-section*/
.teacher-section {
  text-align: center; }
  .teacher-section .items-teacher-div {
    padding-bottom: 20px;
    width: 15%;
    border-bottom: 1px solid #ccc;
    margin: 25px 50px;
    display: inline-block; }
    .teacher-section .items-teacher-div span {
      display: block;
      margin-top: 10px; }
    .teacher-section .items-teacher-div .teacher-name {
      font-weight: bold; }
    .teacher-section .items-teacher-div .teacher-intro {
      text-indent: 2em;
      text-align: left;
      color: #919191;
      width: 100%;
      word-wrap: break-word;
      margin-top: 30px; }
    .teacher-section .items-teacher-div img {
      width: 60%;
      border-radius: 100%; }

/*footer*/
footer {
  color: #CCC;
  text-align: center;
  background-color: #333;
  padding: 30px;
  font-size: 14px; }
  footer span {
    display: block; }
